Glossary
Chalk efficiency
Getting the dry film you need from a small amount of product.
Efficiency here is practical, not a lab score. One thin coat that dries beats three thick coats that smear. A 50 ml bottle in a gym bag gets used. A large bottle left open in a hot car turns to paste and gets thrown out.
The calculator estimates how many applications are in a bottle from the volume you type in. It does not know your brand, and it does not know how heavily you squeeze.